| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___ITERATOR_UNREACHABLE_SENTINEL_H |
| #define _LIBCPP___ITERATOR_UNREACHABLE_SENTINEL_H |
| |
| #include <__config> |
| #include <__iterator/concepts.h> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| #if _LIBCPP_STD_VER >= 20 |
| |
| struct unreachable_sentinel_t { |
| template<weakly_incrementable _Iter> |
| _LIBCPP_HIDE_FROM_ABI |
| friend constexpr bool operator==(unreachable_sentinel_t, const _Iter&) noexcept { |
| return false; |
| } |
| }; |
| |
| inline constexpr unreachable_sentinel_t unreachable_sentinel{}; |
| |
| #endif // _LIBCPP_STD_VER >= 20 |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| #endif // _LIBCPP___ITERATOR_UNREACHABLE_SENTINEL_H |
